Define the following terms related to the operation of the immune system. immunological memory:

specificity: .

self-tolerance: .

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

i think that d. wind is the answer.   i missed the question when i answered a. currents.

i think it is dna, i'm not totally sure but i think it might be.

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.